Stretch Marks During Pregnancy: Genetics, Causes & How to Support Your Skin

Stretch marks are one of the most common skin concerns during pregnancy—and one of the most misunderstood. While genetics can influence how your skin responds to stretching, they are not the only factor. Hormones, growth rate (mama and baby), hydration, and daily skin care all play a role.

The goal isn’t perfection or promises. It’s understanding what’s happening in your skin and supporting it consistently as your body changes.

TLDR: Stretch marks are influenced by genetics, hormones, and how quickly skin stretches—supporting your skin with hydration and gentle care can help keep it comfortable as it adapts.

Note: This article is for educational purposes only and is not medical advice. Always consult your OB/GYN or dermatologist with questions about your skin or pregnancy-safe products.

What are stretch marks?

Stretch marks—also known as striae gravidarum—occur when skin stretches over a relatively short period of time. They form in the dermis, the middle layer of skin that contains collagen and elastin fibers. When these fibers are stressed repeatedly, they can weaken, resulting in visible lines that may appear red, purple, or pink before fading over time.

Are stretch marks genetic?

Genetics can influence natural skin elasticity, collagen structure, and how skin responds to stretching. If stretch marks run in your family, you may be more prone—but genetics alone don’t determine outcomes.

During pregnancy, hormonal shifts and rapid growth place additional demand on the skin. That’s why consistent hydration and gentle, pregnancy-aware skin care are commonly recommended to support skin comfort.

How pregnancy changes your skin

Pregnancy hormones can make skin feel drier, more sensitive, or more prone to irritation. As the belly, breasts, and hips grow, skin stretching can lead to itching and discomfort—two common early signs that skin needs extra support.

Individual results vary. Skincare supports comfort and hydration but outcomes depend on many factors, including genetics and skin response.

Can stretch marks be prevented—or just supported?

There is no guaranteed way to prevent stretch marks. However, many healthcare professionals agree that keeping skin well-hydrated and minimizing irritation may help support skin comfort and appearance during pregnancy.

Ways to support stretch mark-prone skin during pregnancy

• Stay hydrated to support overall skin comfort
• Aim for steady, provider-guided weight gain
• Choose gentle, pregnancy-safe skincare products
• Avoid very hot showers that may dry the skin
• Use consistent daily moisturization to relieve itching

Our Tummy Butter and Bump Gloss Oil are pregnancy-safe, toxin-free options designed to support stretching skin during pregnancy and breastfeeding.

Stretch Marks & Pregnancy FAQs

Are stretch marks caused only by genetics?

No. Genetics play a role, but hormones, baby (and mama's) growth rate, hydration, and skin care routines also influence how skin adapts during pregnancy.

Can skincare products prevent stretch marks?

There is no guaranteed prevention. Skincare products can help support hydration and comfort, which may improve how skin feels as it stretches. Quality pregnancy skincare can help.

When should I start using stretch mark products?

Many people begin supporting their skin early in pregnancy, but it’s never too late to start a gentle, consistent routine.